Apparatus for cleaning, dressing, and grinding wheels



March 18, 1952 G. H. LEFFEL 2,589,620

APPARATUS FOR CLEANING, DRESSING, AND GRINDING WHEELS Filed May 5, 1947 2 SHEETS-SHEET 1 INVENTOR GUY H- LEFFEL ATTORNEYS March 18, 1952 LEFFEL 2,589,620

APPARATUS FOR CLEANING, DRESSING, AND GRINDING WHEELS Filed May a, 1947 2 sHETs--sHEET 2 I l l 1 INVENTOR GUY H- LEFFEL ATTORN EYS Patented Mar. 18, 1952 APPARATUS FOR CLEANING, DRESSING, AND GRINDING WHEELS Guy H. Leffel, Springfield, Ohio, assignor to The Thompson Grinder Company, Springfield, Ohio,

a corporation of Ohio Application May 3, 1947, Serial No. 745,807

3 Claims. 1

This invention relates to improvements in connection with grinding machines, and particularly in connection with the dressing of the Wheel of a grinding machine.

One of the preferred forms of dressing a grinding wheel is by means of a crushing roller which comprises a relatively hard roll which is shaped to the configuration to which it is designed to grind the work pieces. This roll is pressed against the periphery of the grinding wheel and both of them rotated so there is no slipping at the point of contact thereof.

By exerting a radial pressure between the wheel and roller, the roller is operable to crush the bonding of the wheel and thus to transfer thereto the desired configuration. This method of dressing a wheel is of advantage because it results in a good finish on the ground work piece and permits the wheel to be shaped to complex configurations easily and at little expense.

During the crushing operation on the wheel, a coolant is employed in order to improve the quality of the dressing operation. This coolant together with the fine particles of the crushed bonding and the finer abrasive particles removed from the wheel form a sludge which adheres to the surface of the wheel and roller. This sludge detracts from the quality of the crushing operation by making it less accurate and also detracts from the quality of the crushed wheel by filling the holes and cavities therein.

The particular object of the present invention is to provide a means for removing the sludge incident to the dressing operation so that a more accurate and sharper wheel will resultfrom a shorter dressing operation.

A further object of this invention is to remove the sludge referred to above which is a product of the crushing operation in order to preserve the accuracy of the crushing roller and to prevent the wheel being crushed from becoming loaded with the said sludge.

A further object is a provision of an attachment which may be employed on a grinding machine having crushing rollers for removing the sludge resulting from the crushing operation.

These and other objects and advantages will become more apparent upon reference to the accompanying drawings in which:

Figure 3 is a perspective view showing the device itself.

Referring to the drawings, the grinding-wheel is indicated at H] and it is mounted for rotation on a shaft l2 which may be driven in any suitable manner.

The table of the grinding wheel is indicated at l4 and this is preferably a reciprocable member passing the work to and from beneath the grinding wheel. Mounted on-the table I4 a by the bolts I6, is a bed or frame member I8.

The bed or frame member I 8 is adapted for adjustably receiving a bracket or fixture 20 which is slidable along the member l8 and key 24. Rotatably mounted on the fixture 20 is a crushing roller 22.

The roller 22 is aligned with the wheel In by movement relative to the bed l8 along the key 24 and is thereafter clamped in position by the hold down blocks 26.

For supplying coolant to the wheel and roller there may be any suitable spray or nozzle means, for the purpose of this disclosure it is shown as a spray pipe at 28 which directs the coolant towards the point of contact of the wheel and roller.

Positioned to bear on the periphery of the wheel I0 prior to its engagement with the crushing roller is a brush 30. The brush 30 is preferably a good bristle brush adapted for withstanding the abrasive action of the wheel surface and of sufficient stiffness to brush all of the sludge which adheres to the surface of the wheel therefrom.

A second brush of similar material is indicated at 32 and bears against the surface of roller 22 for removing the sludge which adheres to the surface thereof.

For supporting the brushes 30 and 32, there is provided a sheet metal frame 34 which carries a mounting block 36 for the brush 30 and a mounting block 38 for the brush 32. The screws 40 pass through the brushes and into the said supporting blocks and clamp the brushes in any particular position of adjustment. To this end, the brushes are preferably slotted for receiving the screws so the brushes can be adjusted to different size wheels and rollers.

The frame 34 has the lower ends of its Legs turned in as at 42 and carried on each side of the bed I8 is a slotted member 44 for receiving the said turned in portions. The member 34 is shown releasably mounted in a spring-like manner in the member 44. The members 44 are preferably,

mounted on the bed l8 by screws in order to per-f mit the frame 34 to be applied to any crushing roller frame, and also to permit the said bed to be more easily machined.

In operation, the grinding Wheel of the machine and the roller are brought together to their figure 1 position while the said wheel and roller are not rotating. Thereafter, the brushes 30 and 32 advance to bear against the periphery of the wheel and roller. Then, either the wheel, or the roller, or both are driven as indicated by the arrows on Figure 1 and at exactly equal surface speeds. During this period of rotation a radial thrust is exerted in order to bring about the crushing action between the wheel and roller.

During the crushing action, the brushes keep the surfaces of the wheel and roller perfectly clean. After the crushing is completed, the wheel and roller are halted and thereafter the wheel may be employed for grinding work pieces.

After the brushes have once been set no furtherttdjustment thereof is necessary until the wheel, roller, or brushes wear down, or until a different size wheel or roll is placed in the machine.

It will be seen that this invention provides a ready means for insuring clean, sharp wheels when dressed by a crush dressing operation. This invention also preserves the roller and allows -it to be used for a longer period before it must be reworked or replaced.

It will be understood that this invention is susceptible to modification in order to adopt it to different usages and conditions and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

I claim:

1. An apparatus for providing a clean contact surface area between a fluid cooled and lubricated rotatably mounted grinding wheel to be dressed and a crushing roll, comprising a movable table member, a frame member mounted on said table member, a crushing roll rotatably mounted on said frame member and having a contact surface for intimate pressured engagement with a surface of said grinding wheel to shape the same, a frame element releasably mounted on said frame member and having an upper portion thereof spanning said frame member, first and second opposed legs of said frame element supporting said upper portion of said frame element, first brush means mounted on said first leg and adapted to engage said crushing roll during rotation thereof, and second brush means supported by and extending substantially vertically upwardly from said second leg and adapted for engagement with said grinding wheel during rotation thereof.

2. An'apparatus for providing a clean contact surface area between a fluid cooled and lubricated rotatably mounted grinding wheel to be dressed and a crushing roll, comprising a movable table member, a frame member mounted on said table member, a bracket member mounted on said frame member, a crushing roll mounted and a second brush means adjustably supported by and extending substantially vertically upwardly from said second leg, said adjustment being provided for by an elongated slot connection to said second leg and adapted for engagement with said grinding wheel during rotation thereof.

3. An apparatus for providing a clean contact surface area between a fluid cooled and lubricated rotatably mounted grinding wheel to be dressed and a crushing roll, comprising a movable table member, a frame member mounted on said table member, a bracket member mounted on said frame member, a crushing roll mounted on said bracket member and having a contact surface for intimate pressured engagement with a surface of said grinding wheel to shape the same, a frame element releasably mounted on said frame member and having a leg on each side of said frame member extending substantially vertically in the direction of said crushing roll and having a transverse portion of said element connecting the said legs together at about the height of said crushing roll, a first brush element supported on one of said legs at said transverse portion for engagement with said crush roll, and a second brush element adjustably mounted on the second of said legs and extending substantially vertically upwardly therefrom and adapted for engagement with said grinding wheel.

GUY H. LEFFEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,011,573 Butler Dec. 12, 1911 1,280,639 Beier et al Oct. 8, 1918 1,286,518 Brassill Dec. 3, 1918 1,984,729 Dahl Dec. 18, 1934 2,033,046 Montgomery Mar. 3, 1936 2,124,008 Roth July 19, 1938 2,282,770 Sarver May 12, 1942 2,317,533 Joslin Apr. 27, 1943 FOREIGN PATENTS Number Country Date 202,134 Great Britain Aug. 16, 1923 

